Wayfarers of Veeshan

So quick question about the xp bonus this weekend. If you use lesson/xp potions, do those stack with the bonus? And if so how do they stack? Would the bonus from lesson (100%) be added to or multiplied by the bonus? I know potions and lesson don't stack, and lesson and chanter xp aura don't stack. But will this xp bonus and other effects stack?

Would it be base xp * 2.25 (weekend mod) * 2 (lesson mod), or would it be
base xp * 3.25 (weekend mod + lesson mod)

Just curious because I still have all of my xp potions from the promotion, plus I still have something like 5 of those old xp potions that were given out ages ago with some expansion.

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Merlaina Mistweave - 85 Magician

Nemesis of Quillmane and self-proclaimed master of Kedge Keep
Lease holder for the rooftops of Gyrospires Beza and Zeka

If I remember correctly, they do stack, but I could not say exactly how. My belief is that the holiday bonus is applied first (as in the exp you would get from the mob is increased or the zone modifier is increased ) then the potion/lesson acts on that amount.